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    • 12. 发明授权
    • Combined image sensor and display device
    • 组合图像传感器和显示设备
    • US08139055B2
    • 2012-03-20
    • US12303794
    • 2007-06-11
    • Christopher James Brown
    • Christopher James Brown
    • G06F3/038G09G5/00H04N9/04
    • H01L27/14643G06F3/0412G06F3/042G09G3/3648G09G2360/142H01L27/14609H04N5/335
    • A combined image sensor and display device comprises an array of device elements (18), each of which comprises a display pixel (M4, C2, CLC). The display pixels have data inputs connected to column data lines (SL, 6,6′). The array includes sensor elements (10), each comprising a transistor (M1), an integrating capacitor (C1) and a photodiode (D1) connected together to an integrating node (11). The transistor (M1) is connected between column data lines (6,6′). The capacitor (C1) is connected to a control input (RS) which receives a first voltage during a sensing phase for switching off the transistor (M1) and a second voltage during a reading phase for enabling the transistor (M1).
    • 组合的图像传感器和显示装置包括装置元件阵列(18),每个装置元件包括显示像素(M4,C2,CLC)。 显示像素具有连接到列数据线(SL,6,6')的数据输入。 阵列包括传感器元件(10),每个传感器元件(10)包括与积分节点(11)连接在一起的晶体管(M1),积分电容器(C1)和光电二极管(D1)。 晶体管(M1)连接在列数据线(6,6')之间。 电容器(C1)连接到控制输入端(RS),该控制输入端(RS)在用于关断晶体管(M1)的感测阶段期间接收第一电压,并且在读取阶段期间接收第二电压以使晶体管(M1)有效。
    • 13. 发明授权
    • Photosensor and ambient light sensor with constant bias voltage
    • 具有恒定偏置电压的光电传感器和环境光传感器
    • US08138463B2
    • 2012-03-20
    • US12444032
    • 2007-10-04
    • Benjamin James HadwenChristopher James Brown
    • Benjamin James HadwenChristopher James Brown
    • G01J1/42H03B37/02G01J1/44
    • G01J1/44G01J1/1626G01J1/4204G09G3/3406G09G2360/144H01L31/105H01L31/111
    • A method of operating a photosensor comprising: applying a bias voltage to a photosensor (12) comprising n (n>1) photo-sensitive elements (8) connected in series, and determining the photocurrent in the photosensor (12) at a time when the applied bias voltage across the photosensor maintains the photosensor at or close to the point at which it has the greatest signal-to-noise ratio. This may conveniently be done by determining the current in the photosensor at a time when the applied bias voltage across the photosensor is equal or approximately equal to n×Vbi, where Vbi is the bias voltage about which the current in a single one of the photo-sensitive elements (8), in the dark, changes sign. In an embodiment in which the photo-sensitive elements (8) are photodiodes, the bias voltage Vbi is the “built-in” voltage of the photodiodes. The photocurrent generated when n series-connected photodiodes are illuminated is approximately equal to the photocurrent generated when one photodiode is illuminated. However, the leakage current (i.e., the dark current) for the n series-connected photodiodes is significantly lower than the leakage current for one photodiode. The signal-to-noise-ratio is therefore significantly increased.
    • 一种操作光传感器的方法,包括:将偏置电压施加到包括串联连接的n(n> 1)个光敏元件(8)的光电传感器(12),并且在光电传感器(12)中确定光电流 光电传感器两端施加的偏置电压将光电传感器保持在或接近于具有最大信噪比的点。 这可以通过确定光电传感器中的电流在光电传感器上施加的偏置电压等于或近似等于n×Vbi的时间来确定光电传感器的电流,其中Vbi是单个照片中的电流的偏置电压 敏感元素(8),在黑暗中改变迹象。 在光敏元件(8)是光电二极管的实施例中,偏置电压Vbi是光电二极管的“内置”电压。 当n个串联连接的光电二极管被照亮时产生的光电流近似等于当一个光电二极管被照亮时产生的光电流。 然而,n个串联连接的光电二极管的漏电流(即暗电流)明显低于一个光电二极管的漏电流。 因此,信噪比显着增加。
    • 14. 发明申请
    • LIGHT SENSING SYSTEM
    • 光感系统
    • US20100308345A1
    • 2010-12-09
    • US12525911
    • 2008-02-06
    • Christopher James BrownBenjamin James Hadwen
    • Christopher James BrownBenjamin James Hadwen
    • H01L27/144H01L31/105H01L31/12
    • H01L27/1446G02F1/13318G02F1/133555G02F1/13454G02F1/136209G09G3/3406G09G3/3648G09G2360/144H01L31/153
    • A light sensing system comprises a first light sensor (21′), a second light sensor (21) and a first light shielding material (24) disposed over the first light sensor (21′) but not over the second light sensor (21) so as to block ambient light from being incident on the first light sensor (21). A first electrically conductive material (23a) is disposed between the first light shielding layer (24) and the first light sensor and a second electrically conductive material (23b) is disposed over the second light sensor. The second electrically conductive material (23b) is at least partially light-transmissive. Providing the first electrically conductive material (23a) between the first light shielding layer (24) and the first light sensor eliminates any parasitic capacitance that would otherwise be set up by the light shielding layer (24) (which is typically a metallic layer). Providing the second electrically conductive material (23b) over the second light sensor ensures that the two light sensors are as closely electrically matched to one another as possible. Thus, a difference between the output of the first light sensor and the output of the second light sensor may reliably be taken as an indication of the level of ambient light. The first electrically conductive material (23a) and the second electrically conductive material (23b) may be provided by disposing a layer of electrically conductive material, which is at least partially light-transmissive, so as to cover both light sensors.
    • 光感测系统包括第一光传感器(21'),第二光传感器(21)和设置在第一光传感器(21')之上但不在第二光传感器(21)上的第一遮光材料(24) 以阻止环境光入射到第一光传感器(21)上。 第一导电材料(23a)设置在第一遮光层(24)和第一光传感器之间,第二导电材料(23b)设置在第二光传感器上。 第二导电材料(23b)至少部分是透光的。 在第一遮光层(24)和第一光传感器之间提供第一导电材料(23a)消除了否则由遮光层(通常为金属层)设置的寄生电容。 在第二光传感器上提供第二导电材料(23b)确保两个光传感器尽可能彼此紧密地电气匹配。 因此,可以可靠地将第一光传感器的输出与第二光传感器的输出之间的差作为环境光的水平的指示。 可以通过设置至少部分透光的导电材料层来覆盖两个光传感器来提供第一导电材料(23a)和第二导电材料(23b)。
    • 19. 发明申请
    • COMBINED IMAGE SENSOR AND DISPLAY DEVICE
    • 组合图像传感器和显示设备
    • US20100231562A1
    • 2010-09-16
    • US12303794
    • 2007-06-11
    • Christopher James Brown
    • Christopher James Brown
    • G06F3/038G09G5/00
    • H01L27/14643G06F3/0412G06F3/042G09G3/3648G09G2360/142H01L27/14609H04N5/335
    • A combined image sensor and display device comprises an array of device elements (18), each of which comprises a display pixel (M4, C2, CLC). The display pixels have data inputs connected to column data lines (SL, 6,6′). The array includes sensor elements (10), each comprising a transistor (M1), an integrating capacitor (C1) and a photodiode (D1) connected together to an integrating node (11). The transistor (M1) is connected between column data lines (6,6′). The capacitor (C1) is connected to a control input (RS) which receives a first voltage during a sensing phase for switching off the transistor (M1) and a second voltage during a reading phase for enabling the transistor (M1).
    • 组合的图像传感器和显示装置包括装置元件阵列(18),每个装置元件包括显示像素(M4,C2,CLC)。 显示像素具有连接到列数据线(SL,6,6')的数据输入。 阵列包括传感器元件(10),每个传感器元件(10)包括与积分节点(11)连接在一起的晶体管(M1),积分电容器(C1)和光电二极管(D1)。 晶体管(M1)连接在列数据线(6,6')之间。 电容器(C1)连接到控制输入端(RS),该控制输入端(RS)在用于关断晶体管(M1)的感测阶段期间接收第一电压,并且在读取阶段期间接收第二电压以使晶体管(M1)有效。